The OMA Earth Fault Lockout/Loss of Vacuum Relay has been designed and tested to AS/NZS 2081.4:2002 to monitor a power outlet of a power distribution centre and/or Distribution Control Box (DCB). The OMA Relay has an Ex ia un-powered component approval and an [ib] system approval.
Additional information concerning the Ampcontrol OMA Earth Fault Lockout/Loss of Vacuum Relay System. This attachment forms an Integral Part of the IECEx Certificate and all pages MUST be presented and read whenever the IECEx ITA 08.0003X Certificate is presented.
IECEx Certificate of Conformity for Ampcontrol’s OMA Earth Fault Lockout/Loss of Vacuum Relay. Certificate number IECEx ITA 08.003X. date of Issue 24/11/2008
The Ampcontrol EFL-IS relay is IECEx Ex ia certified and is compliant to AS/NZS2081:2011 sections 7 & 9. It has been designed for installation on mining outlets supplying hazardous area equipment that require earth fault lockout and frozen contact protection.
The Ampcontrol EFL-IS Protection Relay provides earth fault lockout (EFLO) and frozen contact (FC) protection that is compliant to AS/NZS 2081:2011 sections 7 & 9. The EFL-IS Relay and EFL-IS Barrier are IECEx certified as Ex ia, provided that the conditions of use in the certification are adhered to.
The Ampcontrol EFL Protection Relay provides earth fault lockout (EFLO) and frozen contactor (FC) protection that is compliant to AS/NZS 2081:2011 sections 7 & 9, it has been designed for installation on mining outlets.
The Ampcontrol ELV is the next generation of earth leakage relays and provides wide bandwidth earth leakage protection (earth fault protection) as per AS/NZS 2081:2011. It has been designed for use on earth fault-limited systems, and particularly coal mining applications. The relay is also suitable for other applications where equipment or system-wide earth leakage protection is required.
Ampcontrol’s EFL, Earth Fault Lockout and Frozen Contactor Protection Relay, is compliant to AS/NZS2081:2011. The EFL is capable of being installed on a wide range of system voltages
from 110V up to 1.1kV (barrier dependent). In addition to EFLO and FC protection, the EFL also offers a selectable undervoltage protection function. The EFL is for use in non-hazardous areas only, for intrinsically safe applications, use the Ampcontrol EFL-IS Relay (174624) and EFL-IS Barrier (174623).
The 2011 revision of AS/NZS2081 correctly recognises that system protection must be assessed in keeping with touch potential curves in AS/NZS4871:2012, but acknowledges that this curve is for 50Hz (power frequency) only. AS/NZS2081 explicitly draws attention to the fact that 50Hz curve sets are not immediately applicable in systems that contain equipment capable of generating non-50Hz components.
Traditional practice is not necessarily safe. Traditional earth fault limits, earth loop impedances and protection clearance time ‘rules of thumb’ do not always result in a safe or compliant system.